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The X86FixupLEAs pass for Intel Atom must not call convertToThreeAddress

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on ADD16rr opcodes, if src1 != src, since that would cause 
convertToThreeAddress to try to create a virtual register. This is not
permitted after register allocation, which is when the X86FixupLEAs pass
runs.

This patch fixes PR16785.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191711 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Preston Gurd 2013-09-30 23:18:42 +00:00
parent a6d841561b
commit 2967a80412
1 changed files with 8 additions and 0 deletions
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8
lib/Target/X86/X86FixupLEAs.cpp
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@ -125,6 +125,14 @@ FixupLEAPass::postRAConvertToLEA(MachineFunction::iterator &MFI,
// which requires isImm() to be true
return 0;
}
case X86::ADD16rr:
case X86::ADD16rr_DB:
if (MI->getOperand(1).getReg() != MI->getOperand(2).getReg()) {
// if src1 != src2, then convertToThreeAddress will
// need to create a Virtual register, which we cannot do
// after register allocation.
return 0;
}
}
return TII->convertToThreeAddress(MFI, MBBI, 0);
}